There's the EMH (Holodoc) and the diagnostic hologram, which was only used the once. There apparently existed at least one backup which was lost on a planet in "Living Witness," but said backup is never mentioned again, so we don't know if they built a new one.
There are approximately 680 EMH Mark Is (the Holodoc's model) in existence. Almost all of them were repurposed to non-medical tasks. One of the few which remained as an EMH made it to the Enterprise, surprisingly.
Bob Picardo has never turned in a bad performance, including when Jeri Ryan played him, so there could have been half a dozen Holodocs on the ship and I wouldn't have complained.
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Any truth is better than indefinite doubt. — Sherlock Holmes
"The Adventure of the Yellow Face," Arthur Conan Doyle
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